R, it's extremely
rare for an audio system to even approach the rated power consumption, because even at loud levels, the average power delivered, and thus used, is a fraction of the ratings. A 20-amp circuit is more than enough for most systems.
However, separate circuits for isolation reasons is another matter. A good, multi-section power conditioner should suffice for your purposes. Stay tuned, others will provide make/model information I can't provide.